Combination lock dial mechanism



Dec.15,1959 H. c. MILLER 2,916,906

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COMBINATION LOCK DIAL \ECHANISII Filed Oct. 30, 1956 2 Sheets-Sheet 2 United States Patent 2,916,906 COMBINATION LOCK DIAL L'IECHANISM I Harry C. Miller, Rochester, I Application October 30, 1956, Serial No. 619,298 8 Claims. (Cl. 70-442 The present invention relates in general to combination lock dials having key locks associated therewith for locking the dials against operation, and more particularly to combination lock dials having key locks associatedtherewith by which the dials can be locked against operation or unlocked for operation together with facilities which may be secured by independent external locking means against operation to invalidate .the key lock and lock the dial against operation.

In many applications of combination locks, it is necessary or desirable that the combination locks be subject to operation by a substantial number of authorized persons having knowledge of the combination of the locks during certain times and that the locks be adapted to be readily conditioned by one person or a restricted group of supervisory personnel to render the combination locks inoperable at other times. This is particularly true in the case of combination locks on the safes of banks or other financial institutions where a number of employees must be able to operate the combination lock during certain hours of the working day, but where the lock should be conditioned under the control of cetrain supervisory personnel to prevent its operation by the employees during other periods of the working day and during the nonworking hours. Additionally, in the case of combination locks on the safes of banks and financial institutions, it is necessary that the combination locks be, at times, sealed under control of a bank examiner or the like to prevent operation of the lock by any person connected with the bank or financial institution.

An object of the present invention, therefore, is the provision of a novel combination lock dial mechanism having facilities associated therewith for effectively locking the dial against operation by means of a key, which is of extremely simple construction and is reliable in operation.

Another object of the present invention is the provision of key locking means associated with a combination lock dial in a novel manner to enable the dial to be conditioned for operation by persons having knowledge of the lock combination or to be locked against such operation by means of a key.

Another object of the present invention is the provision of a novel combination lock dial mechanism having a key lock associated therewith for locking the dial against operation and unlocking the same for operation, wherein the dial may be locked against operation either by the key for the key lock, or by externally exposed manually manipulatable means independent of the key lock.

Another object of the present invention is the provision of a combination lock dial mechanism having key lock means associated therewith for locking the dial against operation and unlocking the same to permit operation together with means which may be secured. in selected position by independent locking means applied to the mechanism to maintain the dial in locked condition and disable the key lock from unlocking the dial.

ice

Other objects, advantages and capabilities of the present invention will become-apparent fromthe following detail description, taken in conjunction with the accompanying drawings illustrating several preferred embodiments of the invention. l v i In the drawings: 7

Figure 1 is a front elevation view of a combination lock dial and key lock mechanismembodying the present invention;

Figure 2 is a side elevation view of the combination lock dial and key lock mechanism "with a padlock applied thereto with the dial held in locked condition under sole control of the padlock;

Figure 3 is a verrtical section view taken along the line 3-3 of Figure 1, with the slide'in dial locking position;

Figure 4 is a vertical section view taken along the line 4-4 of Figure 3;

Figure 5 is an exploded perspective view of the combination lock dial and key lock mechanism; and,

Figure 6 is a perspective view of an alternative wafer tumbler which is substituted for the rearmost wafer tumbler illustrated in Figure 5 in a modified version of the mechanism together with the dial locking slide and the rear cover plate conditioned in accordance with the modified form.

Referring to the drawings, wherein like reference characters designate corresponding parts throughout the several figures, the dial and key locking unit of the present invention, indicated in general by the reference character 10, includes a'key locking dial ring 11 which is preferably die cast of metallic material, and comprises an annular cylindrical dial ring portion 12 and a depending key lock case portion 13 integral with the dial ring portion 12. The annular cylindrical dial ring portion 12 has a forwardly opening relieved portion forming a sight opening 14 through which the dial markings may be viewed, the sight opening extending over a region corresponding to 15-20 dial graduations. A spider 15 comprising three radial arrns in the preferred embodiment, is formed integrally with the dial ring portion 12 adjacent the rear plane of the dial ring 11 and supports an annular bearing 16 in coaxial relation with the dial ring portion 12. The annular bearing 16 rotatably supports a tubular dial sprindle 17 in the preferred embodiment which projects rearwardly from the dial 18 of a combination lock. The combination locks with which the preferred embodiment of the present invention is designed to be used are of the plural wheel tumbler type disclosed in my prior Patent No. 2,575,674, granted November 20, 1951. In such combination locks, the dial and drive cam are both fixed to a tubular dial spindle. A lost motion driving connection is provided between the drive cam and the rearmost wheel tumbler and between the successive wheel tumblers to effect adjustment of the tumblers in accordance with preselected rotation of the dial. An inner spindle manipulated by a knob which is exposed at the forward face of the dial knob extends coaxially through the dial spindle and manipulates a slide on the driving cam to selectively expose and bridge the driving cam gate. 7

The dial 18 is of generally rearwardly opening cupshaped form comprising a circular front wall 19 and an integral annular peripheral flange 20 having dial markings 21 formed therein. The usual knurled dial knob 22 projects forwardly from the front wall 19 of the dial 18. The front wall of the dial knob 22 is recessed in a concave spherical path and accommodates a knob 23 which is fitted to the usual inner spindle mounted within the tubular dial spindle 17 for manipulating the drive cam slide in locks of the type illustrated in mysaid prior patent.

A cylindrical boss 24 is formed integrally with the dial front wall 19 at the inner face thereof in surrounding relation to the dial spindle 17 and is provided with a dial locking recess 25 at the periphery thereof which is positioned to open downwardly when the dial 18 is positioned with its zero mark in alignment with the fixed index mark 26 formed on the dial ring portion 12 at the center of the sight opening 14.

The depending key lock case portion 13 includes a front wall 27 having a centrally disposed circular key opening 28 therein, a pair of integral side walls 29 and a bottom wall 30 having a centrally relieved rectangular opening 31 therein. Bosses 32 are integrally formed within the case portion 13 at the four corners of the interior chamber of the case portion 13 to provide supporting surfaces for the key lock case cover plate 33 which is mounted in position by screws 34 extending through accommodating openings in the cover plate 33 and into threaded sockets in the corner bosses 32. A bridging bar 35 extends between and is integrally formed with the two lowermost corner bosses 32 and supports a depending hasp 36 which is formed integral with the bridging bar 35 and projects through the rectangular opening 31 in the bottom wall 30. The hasp 36 is provided with an aperture 37 which is spaced below the bottom wall 30 of the case portion 13 to receive the shackle of a conventional key padlock 38.

A conventional key cylinder 39 is journaled in the key opening 28 in the front wall 27 of the key lock case 13 in a conventional fashion and is provided with the usual keyway for accommodating the bit of the key 40 for the dial key lock. The key cylinder bears against the shoulder of the inwardly projecting flange 41 at the entrance to the key opening 28, the flange 41 being likewise provided with a keyway 42at the lowermost point along the flange 41 to permit insertion and withdrawal of the key when the key is arranged in a vertical plane with the bitings extending downwardly.

A plurality of wafer tumblers 43-47 are disposed in overlying relation with each other in parallelism with the front wall 27 of the key lock case 13 and are rotatably supported on the tumbler post 48 projecting rearwardly from the front wall 27. The tumblers are each biased in a clockwise direction about the post 48, as viewed in Figure 4, by means of leaf springs 49 whose ends bear against the left side wall 29 of the lock case 13, thus urging the key-engaging surfaces 50 of the wafer tumblers 43-47 against the cylindrical surface of the key cylinder 39 and into contact with the key bitings when the key is rotated into the appropriate positions. The upper ends of each of the wafer tumblers 43-47 are provided with forwardly opening gatings or recesses 51 having terminal rabbets in one side thereof providing shoulders 52.

Disposed rearwardly of the tumblers 43-47 and immediately inwardly of the cover plate 33 is a dial locking slide 53 which is guided for rectilinear reciprocable movement along an axis intercepting the axes of the key cylinder 39 and the dial spindle 17 by a guideway 54 in the lower zone of the dial ring portion 12 and guide surfaces provided by the rearwardly facing surface of the bridging bar 35 and the inwardly facing surfaces of the lowermost corner bosses 32. The tail or flag 55 of the slide 53 is in the form of a forwardly projecting bifurcated flange which flanks the padlock hasp 36 and is-accommodated in the rectangular opening 31 in the bottom wall 30 when the slide is in its uppermost position. The upper end of the slide 53 is provided with a dial locking tongue 56 which snugly fits into the dial locking recess 25 in the cylindrical dial boss 24 when the slide is in its uppe most position. A fence 57 projects forwardly from one side of the dial locking slide 53 and extends in overlying relation to the upper ends of the wafer tumblers 43-47 when the slide 53 is in elevated locking position. When the proper key is not in contact with the key-engaging surfaces 50 of the wafer tumblers 43-47, the gatings 51 of the tumblers are out of registry with each other and are out of alignment with the axis of movement of the fence 57 so that the fence 57 would be intercepted upon attempted downward movement of the slide 53 by the upper 6 ends of the wafers 43-47 or by the shoulders 52 thereon.

An opening 58 is also provided in the slide 53 in alignment with the key cylinder 39. The surface of the key opening from the point 59 to the point 60 and from the point 61 to the point 62 is concentric with the axis of the key cylinder 39 when the dial locking slide 53 is in elevated position locking the dial 18 against rotation. The surface of the slide opening 58 between the points 63 and 64 is of reduced radius to accommodate the reduced diameter rearmost portion 39' of the key cylin- 16 der 39 when the slide 53 is in this position. The surface of the opening 58' between the points 60 and 61 is the same radius as that of the surface between the points 63 and 64, but is formed about a center spaced vertically from the center of the last-mentioned surface to accommodate the portion 39' of the key cylinder 39 when the slide 53 is in lowered or unlocked position. Shoulders 65 and 66 bounding the notch 67 are so located as to be engaged by the outermost biting 68 of the key 40 during counterclockwise and clockwise rotation of the key, respectively, as viewed in Figure 4, to lower the slide 53 to unlocking position and raise the slide to locking position, respectively. During the time when the key 40 is positioned to dispose the biting 68 in driving relation to the shoulders 65, 66, the remaining bitings of the key 40 are in engagement with the key-engaging surfaces 50 of the tumblers 43-47 to position the tumblers so as to align their gatings 51 to receive and permit free movement of the fence 57.

The cover 33 is provided with two laterally spaced cuts in the upper edge thereof to provide a bendable tongue 69 which, in certain forms of the invention where it is desired to prevent removal of the key when the slide is in unlocked position, may be bent inwardly into the vertically extending slot 70 of the slide 53 and form a stop for engaging the upper edge of the slot 70 upon preselected downward movement of the slide 53. The length of the slot 70 and the position of the tongue 69 are such that the upper edge of the slot 70 will engage the tongue 69 just before the biting 68 of the key 40 bearing against the shoulder 65 has completed downward movement of the slide 53 and, therefore, before the slide is positioned to allow the biting 68 to leave the notch 67. Therefore, when the tongue 69 has been bent inwardly, the key 40 cannot be rotated through a full 360 degrees during unlocking movement of the slide and, although the amount of slide movement permitted is sufficient to disengage the tongue 56 from the recess 25, the key cannot be rotated sufficiently with the slide 53 in unlocked condition to permit the bitings to be aligned with the keyway 42 and be allow withdrawal of the key. As will be later described, the tongue 69 is not bent inwardly in the several forms of the invention wherein it is desired to permit the key to be withdrawn from the key lock when the slide is in either locked or unlocked condition.

In the operation of the above-described form of the invention, the slide 53 when in dial locking position will be in elevated condition with its tongue 56 seated in the recess 25 in the dial boss 24 and its fence 57 spaced slightly above the upper ends of the wafer tumblers a5 43-47.- In this position, the bifurcated flange forming the flag 55 at the lower end of the slide 53 is accommodated in the opening 31 in the bottom wall 30 of the key lock case portion 13. If a shackle of a key padlock, such as the padlock 38, is then inserted through the opening 37 of the hasp 36, the shackle of the padlock will prevent lowering of the slide 53 out of locking engagement with the dial locking recess 25, even if the proper key 40 is inserted in the key lock to position the tumbler gatings 51 in alignment with the fence 57. Thus, by

means of the application of such a padlock 38 to the dial and key lock unit 10, a person such as a bank examiner can completely disable the unit to prevent operation either by the employees knowing the combination or by the person having the proper key for the unit.

Assuming that the padlock 38 has been removed from the unit, and that a proper key 40 has been inserted into the key cylinder 39, rotation of the key in a counterclockwise direction, as viewed in Figure 4 through about 200 degrees from the inserted position will produce no action on either the tumblers or the slide 53 as the bitings do not come into engagement with the tumblers 43-47 and the surfaces of the slide opening 58 contacting the biting 68 during this range of movement are concentric with the rotation of the axis of the key. Upon slight further counterclockwise movement of the key 40, the bitings other than the biting 68 engage the key-engaging surfaces 50 of the wafers 4347 and when the key approaches a position about 270 degrees from the inserted position, the tumbler gatings 51 are properly aligned to receive the fence 57. During further rotation of the key through about 20 degrees the biting 68 engages the shoulder 65 of the notch 67 and forces the slide 53 downwardly to project the fence 57 into the tumbler gatings 51 and lower the slide '53 to unlocking position. Further counterclockwise rotation of the key 40 to the inserted position will effect no further action on the slide and the key may then be withdrawn from the key cylinder 39. The slide 53 is then free to be manually elevated to locking position when the operator pushes upwardly on the flag portion 55 and the slide upon such manipulation will be retained in elevated or locking position as the fence 57 will pass upwardly out of the tumbler gatings 51 and the tumblers will snap into misaligned condition retaining the slide in locking position. Alternatively the key may be reinserted in the cylinder 39 and rotated in a clockwise direction, as viewed in Figure 4, during which movement the biting 68 will be rotated into contact with the shoulder 66 of the notch 67 and elevate the slide to locking position. Thus, with this form of the invention, the key may be withdrawn from the cylinder 39 through the keyway 42 whenever the slide 53 is either in locking position or unlocking position, and when the slide 53 has been disposed in unlocking position it can be returned to locking position either by means of the key 40 or by external manual manipulation of the flag 55.

The structure described above may be modified to prevent withdrawal of the key 40 from the cylinder 39 when the slide 53 is in lowered or unlocking condition by bending the tongue 69 inwardly into the slot 70 of the slide 53 so as to prevent full rotation of the key 40 and position the key with the biting 68 still extending into the notch 67 when the slide 53 has reached unlocking position. In this condition, the remaining bitings will stay in engagement with the wafer tumblers 43-47 and the flange 28 so that these tumblers and flange prevent withdrawal of the key. This is a desirable form in many applications as the presence of the key in the unit when the slide is in unlocking position serves as a readily detectable visual sign that the dial is free to be operated.

Figure 6 discloses a slightly modified form involving the substitution of another element for the rearmost wafer tumbler 47 in order to prevent manual shifting of the slide 53 from dial unlocking position to dial locking position in response to pressure on the flag 55. In this embodiment, therefore, the slide can be shifted to and from locking condition wherein the tongue 56 is seated in the dial locking recess 25 only by means of the key 40. In this embodiment, a modified wafer tumbler 71 displaces the wafer tumbler 47 which comprises a body portion 72 having an aperture adapted to receive the tumbler post 48 and a key-engaging surface 73 located along a marginal edge thereof to be engaged by the biting of the key 40 adjacent to the biting 68. Adjacent the upper end of the body portion 72 of the modified wafer tumbler 71 is an integral rearwardly projecting shoulder member 74 which is adapted to overlie or underlie the terminal portion of the fence 57 when the slide 53 is in dial unlocking and locking positions, respectively, and the appropriate biting of the key 40 is out of engagement with the key-engaging surface 73. A suitable rabbet 75 is provided in the upper surface of the fence 57 adjacent the forwardly projecting end thereof for accommodating the terminal portion of the shoulder member 74 when the bar is in overlying relation to the fence 57. In this embodiment, the location of the rearwardly projecting shoulder member 74 of the modified wafer tumbler 71 in overlapping relation to the terminal portion of the fence 57 and in the path of movement thereof when the slide 53 is in lowered or dial unlocking position, prevents manual shifting of the slide 53 upwardly into locking position in response to pressure on the flag 55. The appropriate biting of the key 40, however, engages the key-engaging surface 73 of thetumbler 71 during the entire sector wherein the key positions the gatings 51 of the tumblers 43-46 in position to receive the fence 57 and for a short range of key movement to either side of this sector and shifts the tumbler 71 against the resilient bias of its leaf spring 76 to dispose the shoulder member 74 to the left of the fence 57, as viewed in Figure 4, an out of intercepting relation therewith to free the slide 53 for upward or downward movement in response to the key 40. Thus, by virtue of the coaction between the rearwardly projecting shoulder member 74 and the fence 57 of the slide 53, movement of the slide 53 by manual pressure on the flag 55 is prevented and positioning of the slide is rendered solely responsive to the key 40.

As will be apparent from the foregoing description, insertion of the shackle of the padlock 38 through the opening 37 of the depending hasp 36 when the slide 53 is elevated into dial locking position prevents downward movement of the slide 53 in response either to movement of the key 40 or any other means of applying downward pressure thereto as the padlock shackle lies immediately below and in the path of movement of the bifurcated flange 55 at the lower end of the slide 53.

While several preferred and practical embodiments of the invention have been disclosed in the above description, it will be understood by those skilled in the art that the disclosure represents exemplary embodiments and that other re-arrangements of parts cooperable to carry out the inventive concept are to be regarded as within the purview of the invention.

1 claim:

1. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle, a centrally located integral cylindrical boss projecting rearwardly from said dial in fixed relation thereto having a peripheral locking recess opening radially of said dial, a key locking mechanism including a slide member supported for rectilinear reciprocative movement along a radial axis of said dial spindle and having a dial locking tongue at one end thereof to be projected into said locking recess in dial locking position and withdrawn from said recess in dial unlocking position, the other end of said slide member comprising lock condition indicator means projecting into an exposed observable position when said slide member is in said unlocking position and disposed in an upwardly spaced readily detectable different position when the slide member is in locking position to enable supervisory personnel to visually detect whether the dial is in locked or unlocked position by observing the position of said other end of said slide member, means in said key locking mechanism cooperable with said slide member to restrain the latter against movement withdrawing said tongue from said locking recess when said slide member is in locking position and responsive to a key to release said slide member for movement from said locking position to said unlocking position over a preselected range of rotation of the key, and means interconnecting said slide member with the key in said key lock mechanism for shifting said slide member between locking and unlocking positions in response to the key when the key is disposed within said preselected range of rotation.

2. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle including a boss coaxialwith said spindle having a dial locking recess opening radially of said dial, a key lock casing communicating with said dial ring, a key locking mechanism in said casing including a slide member supported for rectilinear reciprocative movement along a radial axis of said dial spindle and having a dial locking tongue at one end thereof to be projected into said locking recess in dial locking position and withdrawn from said recess in dial unlocking position, the other end of said slide member projecting from said easing into an exposed observable position when said slide member is in said unlocking position to provide an indicator of the locked and unlocked condition of said dial, means in said key locking mechanism cooperable with said slide member to restrain the latter against movement withdrawing said tongue from said locking recess when said slide member is in locking position and responsive to a key to release said slide member for movement from said locking position to said unlocking position over a preselected range of rotation of the key, and means interconnecting said slide member with the key in said key lock mechanism for shifting said slide member betweenlocking and unlocking positions in response to the key when the key is disposed within said preselected range of rotation, said last-mentioned means including further means which releases said slide member for movement from unlocking position to locking position independently of said key in response to manual pressure upon said exposed other end of said slide member.

3. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle and including an integral boss projecting rearwardly from the dial in coaxial relation with said spindle having a dial locking recess opening downwardly radially of said dial, a key lock casing including front, side and bottom walls formed integrally with said dial ring communicating with said dial ring in depending relation thereto, a slide member slidably supported in said casing for rectilinear reciprocative movement along a radial axis of said dial spindle, said slide member having a locking tongue at the inner end thereof which is projected into locking engagement in said dial locking recess when said slide member is shifted inwardly into locking position and which is withdrawn from said recess when said slide member is shifted outwardly to unlocking position, the other end of said slide member comprising lock condition indicator means projecting from said casing when said slide member is in said unlocking position and disposed in an upwardly spaced readily detectable different position when the slide member is in locking position to enable supervisory personnel to visually detect whether the dial is in locked or unlocked position by observing the position of said other end of said slide member, an integral fence on said slide member, a key locking mechanism in said key lock casing including a plurality of pivoted wafer tumblers normally biased when said slide member is in locking position to bar movement of said slide member and having gatings adapted to be positioned in registry with said fence in response to a key to accommodate said fence during movement of said slide member from locking to unlocking position, and means interconnecting said slide member with the key for shifting said slide member between locking and unlocking positions upon rotation of the key when said tumbler gatings are in registry with said fence.

4. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle and including an integral boss projecting rearwardly from the dial in coaxial relation with said spindle having a dial locking recess opening downwardly radially of said dial, a key lock casing including front, side and bottom walls formed integrally with said dial ring communicating with said dial ring in depending relation thereto and having an apertured hasp projecting from the bottom wall thereof adapted to receive a padlock shackle, a slide member slidably supported in said casing for rectilinear reciprocative movement along a radial axis of said dial spindle, said slide member having a locking tongue at the inner end thereof which is projected into locking engagement in said dial locking recess when said slide member is shifted inwardly into locking position and which is withdrawn from said recess when said slide member is shifted outwardly to unlocking position, the other end of said slide member projecting from said casing and terminating in a bifurcated flange adapted to flank said hasp projecting from said casing arranged to be positioned immediately inwardly of said hasp opening when said slide member is in locking position and prevent unlocking movement of said slide member when a padlock shackle occupies said hasp opening, an integral fence on said slide member, a key locking mechanism in said key lock casing including a plurality of tumblers normally biased when said slide member is in locking position to bar movement of said slide member and having gatings adapted to be positioned in registry with said fence in response to a key to accommodate said fence during movement of said slide member from locking to unlocking position, and means interconnecting said slide member with the key for shifting said slide member between locking and unlocking positions upon rotation of the key when said tumbler gatings are in registry with said fence.

5. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle and including an integral boss projecting rearwardly from the dial in coaxial relation with said spindle having a dial locking recess opening downwardly radially of said dial, a key lock casing communicating with said dial ring in depending relation thereto and having an apertured hasp projecting from one wall thereof adapted to receive a padlock shackle, a slide member slidably supported in said casing for rectilinear reciprocative movement along a radial axis of said dial spindle, said slide member having a locking tongue at the inner end thereof which is projected into locking engagement in said dial locking recess when said slide member is shifted inwardly into locking position and which is withdrawn from said recess when said slide member is shifted outwardly to unlocking position, the other end of said slide member projecting from said casing and terminating in a bifurcated flange adapted to flank said hasp projecting from said casing arranged to be positioned immediately inwardly of said hasp opening when said slide member is in locking position and prevent unlocking movement of said slide member when a padlock shackle occupies said hasp opening, an integral fence on said slide member, a key locking mechanism in said key lock casing including a plurality of tumblers normally biased when said slide member is in locking position to bar movement of said slide member and having gatings adapted to be positioned in registry with said fence in response to a key to accommodate said fence during movement of aid slide member from locking to unlocking position, and means interconnecting said slide member with the key for shifting said slide member between locking and unlocking positions upon rotation of the key when said tumbler gatings are in registry with said fence, one of said tumblers having a rearwardly projecting shoulder member positioned to overlap said fence in the path of movement thereof when said slide member is in unlocking position and prevent movement of said slide member in response to pressure on said other end thereof, said last-mentioned tumbler being displaceable by said key to shift said shoulder member out of the path of movement of said fence during the time the key aligns said tumbler gatings in registry with the fence.

6. In the combination recited in claim 2, means for preventing withdrawal of the key from the key lock casing when said slide member is in dial unlocking position comprising key admission means having a keyway for accommodating the key for insertion into said key locking mechanism and withdrawal therefrom at a preselected position of key orientation and a bounding flange interlocking with said key at all other positions of key orientation when the key is inserted into the key locking mechanism to prevent withdrawal of the key, said key being rotatable in one direction to unlock said dial and in the opposite direction to lock said dial, said slide member having anelongated slot therein aligned with the axis of movement of the slide member, said key lock casing having a bendable tongue projectable into said slide member slot to form a limit stop cooperative with said slot to terminate unlocking movement of said slide member at a preselected unlocking position of said slide member wherein said key is disposed within said preselected range of rotation in interlocked relation with said bounding flange, and said slide member having means for preventing rotation of said key in said dial unlocking direction to said preselected position of key orientation when said slide member is at said preselected unlocking position.

7. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle, including a boss coaxial with said spindle having a dial locking recess opening radially of said dial, a key lock casing communicating with said dial ring, a key locking mechanism in said casing including a slide member supported for rectilinear reciprocative movement along a radial axis of said dial spindle and having a dial locking tongue at one end thereof to be projected into said locking recess in dial locking position and withdrawn from said recess in dial unlocking position, the other end of said slide member projecting from said casing, said casing having an apertured projection lying adjacent said other end of said slide member adapted to receive a padlock shackle through the aperture thereof,

and said other end of said slide member terminating in abutment means arranged to be positioned immediately inwardly of the aperture in said projection when said slide member is in locking position and prevent unlocking movement of the slide member when a padlock shackle occupies said aperture in said projection, means in said key locking mechanism cooperable with said slide memher to restrain the latter against movement withdrawing said tongue from said locking recess when said slidemember is in looking position and responsive to a key to release said slide member for movement from said locking position to said unlocking position over a preselected range of rotation of the key, and means interconnecting said slide member with the key in said key lock mechanism for shifting said slide member between locking and unlocking positions in response to the key when the key is disposed within said preselected range of rotation.

8. A combination lock dial mechanism comprising a dial ring having a central spindle bearing, a spindle rotatably supported in said bearing for actuating a combination lock mechanism, a circular combination lock dial fixed onto said spindle and including an integral boss projecting rearwardly from the dial in coaxial relation with said spindle having a dial locking recess opening downwardly radially of said dial, a key lock casing communicating with said dial ring in depending relation thereto, a slide member slidably supported in said casing for rectilinear reciprocative movement along a radial axis of said dial spindle, said slide member having a locking tongue at the inner end thereof which is projected into locking engagement in said dial locking recess when said slide member is shifted inwardly into locking position and which is withdrawn from said recess when said slide member is shifted outwardly to unlocking position, the other end of said slide member projecting from said casing, an integral fence on said slide member, a key locking mechanism in said key lock casing cooperable with said slide member to restrain the latter against movement withdrawing said tongue from said locking recess when said slide member is in locking position and responsive to a key to release said slide member for movement from said locking position to said unlocking position, means interconnecting said slide member with the key for shifting said slide member between locking and unlocking positions upon rotation of the key when the key locking mechanism is positioned to release the slide member for movement to unlocking position, said key locking mechanism including a tumbler having a rearwardly projecting shoulder member positioned to overlap said fence in the path of movement thereof when said slide member is in unlocking position and prevent movement of said slide member in response to pressure on said other end thereof, said tumbler being displaceable by said key to shift said shoulder member out of the path of movement of said fence during the time the key conditions said key locking mechanism to release said slide member for movement.

References Cited in the file of this patent UNITED STATES PATENTS 243,872 Doremus July 5,1881 1,166,231 Lewis Dec. 28, 1915 1,333,874 Platt Mar. 16, 1920 1,413,450 Zuckerman Apr. 18, 1922 2,728,215 Bremer Dec. 27, 1955 FOREIGN PATENTS 499,017 Belgium Feb. 15, 1951 

